| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a signal masking circuit and a semiconductor integrated circuit, preventing a read data strobe signal from becoming a Hi-Z state at masking and gating of the read data strobe signal. <P>SOLUTION: This signal masking circuit has: a detection circuit detecting a period of logic "L" of the read data strobe signal, and generating a gating signal when the period is a prescribed period; a delay read data strobe signal generation circuit; a gating circuit allowing the gating of a delay read data strobe signal, and generating a first mask read data strobe signal; a count circuit counting a fall of the first masked read data strobe signal until a prescribed number of signals fall, and generating a mask signal masking the first masked read data strobe signal; and a mask circuit masking the first masked read data strobe signal, and outputting a second masked read data strobe signal. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
